Allow lists to be included per contact in bulk JSON update

Allow lists to be included per contact in bulk JSON update

Can you please allow lists as an array on a per-contact basis? If you would allow that it would reduce the number of required API calls significantly, and allow a much simpler programming process for updating.

The lists array outside of the contacts array could also remain, which would apply to all contacts, however, being able to specify lists per-contact would be extremely helpful.